Question 346231
Hi,
*Let r be the rate he can row in still water and c be the current.
r*t =d (rate*time = distance)
.
The question states the following to be true:
.
(r-c)4hr = 16mi Upstream r = 4 + c
and
(r+c)2hr = 16mi  Downstream
.
Substitute
((4+c)+ c)*2 = 16
Solve:
((4+c)+ c) = 8
2c + 4 = 8
2*c = 4
{{{c = highlight(2(mi/hr))}}} 
{{{r =highlight(6(mi/hr))}}}
.
Check Your answer:

(6-2) *4 =  16
(6+2) *2 = 16